Furnace-grate-bar construction



Aprilzs, 1930. -H w NEAL 1,756,697

FURNACE'GRATE BAR CONSTRUCTION 2721 Il) .Zzjv

. ."Zb" v ZZ* 20L I f fr Vi 1375-1 A A 23 .25h/f* f1 v .4

.mswm' Patented Apr. 29, 1930 ST'T HARRY W. NEAL, F INDANAPOLI-S, INDIANAQASSIGNOR TO HALL-NEAL FUR-NACE COMPANY, `02E INDIANAPOLIS, -INDIIANA FURNAoE-eiiiiTn-Ban oons'rnnofrron Application filed October 26, 1828. Serial No. 315,137.

This invention relates generally to furnaces and in particular to a grate bar mounting having for its primary object the provision for the quick and easy removal and replacement of grate bars in a simple and inexpensive manner without the necessity of having to dismantle the fire pot or bowl of the furnace or the wall of the furnace in any manner. Other objects reside in the provision made for warping of the bars, interchangeable means for rocking a selected number ofthe bars at one time in shaking down ashes and for means in retaining the various parts in alinement.

The invention is described in reference to the accompanying drawing, in which- Fig. 1 is a front elevation of a house heating furnace embodying my invention;

Fig. 2, a transverse horizontal section 2o through thefurnace on theline 2-2 in Fig. 1

Fig. 3, a vertical section on the line 3-3 in Fig. 2;

Fig. 4, a longitudinal vertical section on the line 4 4 in Fig. 2 showing the grate bar in side elevation;

Fig. 5, a vertical section on the line 5-5 in Fig. 2; and

Fig. 6, a vertical section on the line 6 6 in Fig. 5. Like characters of reference indicatelike parts throughout the several views in the drawing.

Within the body 10 of the furnace is mounted the horizontal gratering 11, from the under side of which are supported the grate bars 12, 13, 14, and 15. Each bar has a reduced cylindrical section loosely fitted through respective rear bearings 16, 17, 18, and 19, and also has a reduced cylindrical section 22 passed between two ribs 2O and 21 (Figs. 2 and 5) which section 22 rests on a lug 23 which removably slips against'the forward faces of the ribs 20 and 21 and drops down into pockets 24 and 25.

Each of the bars 12, 13, 14 and 15 has a shoulder 26 formed on it from which extends forwardly a three-sided shank 27, to carry with a loose sliding fit thereon a gear 28 having an extending hub 29. As indicated in Fig. 2, the gears 28 on the bars 12 and 13 arey in mesh and have their respective hubs 29 turned to bear against the shoulders 26, while the gears 28 on the bars 14 and 15 are in mesh and with their respective hubs 29 turned outwardly, whereby rocking the bar 12 ywill rock the bar 18, and rocking the bar 15 will rock the bar 14, the bars thereby being interconnested through the gears 28 in pairs. It is obvious that the gears 28 on the bars 14 and 15 may be reversed in position, in which reversed position all four gears 28 would mesh consecutively ene with the other (not shown) and the rocking of any one bar could rock the other three. 4

Now to prevent the gears 28 from sliding out of mesh or off the Shanks 27, I place a plate 30 over the ends of rt-he shanks 27 and against thel gears, the plate 30 having-holes suitably spaced to permit the vShanks 27 to extend freely therethrough (Fig. A. stub shaft 31 has a-socket32 to fit loosely over the end of the shank 27 on the bar 12 Land against the plate 30.

12'and 13. A similar' shaft 39 fits over they `end of the shank 27 'of the bar 15 and against the plate 30' and has a reduced shank 40A extended through the plate 41. Since theplates 36 `and 41 prevent'the shafts 31 and 39 from sliding forward'the gears 28 are effectively held on theshanks 27 through the intervening plate 30. All of the parts are fitted oneto the other rather loosely to allow for expansion and warping. Since the forward ends of the bars rest'entirely on the lugs 28, any normal warping of the bars will not affect their being turned. The sockets on the ends of the shafts 31 and 39 being iittedloosely also permit of considerable misalinement before any binding will occur. '.To remove a grate bar, the plates 86 and 4 are taken off whereupon the shafts 31 and 39 are pulied out through the casting y34, the

plate 8O is slipped off the shanks 27 ,the gear la@ v end from between the ribs and pulling the bar forward to disengage it from the rear bear'n ing, the bar being replaced in reverse manner.

I claim: A 1. In a furnace, a grate bar removably carried in the furnace, a shank on the forward end of the bar, a gear slidably carried on the shank but fixed to rotate therewith, a shaft having a socket adapted to lit over the end of the shank extending through said gear, a removable p'late on said furnace, through which said shaft extends, and a shoulder on said shaft bearing against said plate whereby said l supported in the furnace, a shank on the for-v shaft socket is held on said shank.

2. In a4 furnace, a grate bar, a bearing in which the rear end of the bar is rotatably supported, arpair of spacedapart ribs between which the front end of the bar passes, and a lug removably carried adiacentand across the opening between said ribs under said bar, a shank on the forward end of the bar, a gear slidably carried on the shank but fixed to rotate therewith, a shaft having a socket adapted to fit over the end of the shank extending throughv said gear, a removable plate on said furnace, through which said shaft extends, and a shoulder on said shaft bearing against said plate ywhereby said shaft socket is held on said shank,

3. In a furnace, a plurality of grate bars ward end of each bar, a gear carried on each shank adapted to slide longitudinally thereon but fixed to rotate therewith, a retaining plate having holes to permit the ends of the Shanks to extend therethrough, a furnace walhshafts passing through holes in said wall and having sockets in their inner ends fitting over ends of selected bar shanks to retain said plate against said gears, plates removably attached to Said wall over said holes and supportingthe front ends of the shafts, and shoulders on said shafts bearing against said plates whereby said shafts are prevented from sliding forwardly ofil the shanks. j

4.' In a furnace, a plurality of grate bars Vrockably supported therein,A a shankon the forward end of each bar, a gear on each shank Y slidable longitudinally thereon but fixed to rotate therewith, a spacing hub on each gear, said gears being positioned -on said Shanks whereby the hub on adjacent gears are turned one way and on other gears are turned in the reverse direction to have the gears meshed in separate groups, a retaining plate having the endsof the Shanks extending rotatably therethrough, shafts having sockets formed in their inner ends to engage'over the shank ends, a furnace wall, oneof saidshafts having its socket end carried on a bar shank in each of Vshoulder on each of said shafts behind said cover plates limiting the longitudinal movement of the shafts whereby the retaining plate is held across the shanks against said gears and gear hubs.

5. In a furnace, a grate bar construction comprising a plurality of grate bars each having its rear end carried in a bearing and the front end movable vertically between spaced apart ribs with a removable lug between said ribs limiting the downward movement, gears reversably and slidingly carried on shanks of the bars ahead of said ribs, 'a gear-retaining plateV across the forward sides of the gears, a shaft removably extended from the ends of selected shanks which extend through said gears and said plate, and other plates removably secured on the furnace through which said shafts rotatably pass and by which longitudinal `travel of the shafts from the shanks is prevented.

In testimony whereof I affix my signature.

HARRY w, Nunn 

